[1] LIBRA Fdn, Portland, ME USA
[2] Inst Alas, Salta Salta, Argentina
[3] Hosp Univ Vall, Barcelona, Spain
[4] Ctr Med Docente La Trinidad, Caracas, Venezuela
[5] Hosp Gen Ninos Pedro Elizalde, Buenos Aires, DF, Argentina
[6] Univ Nacl La Plata, La Plata, Buenos Aires, Argentina
[7] Univ Salvador, Salvador, BA, Brazil
[8] Univ Fed Parana, Curitiba, Parana, Brazil
[9] Fed Hosp Servidores Estado, Fac Med Souza Marques, Rio De Janeiro, Brazil
[10] Hosp San Angel, Mexico City, DF, Mexico
[11] Univ Espiritu Santo, Guayaquil Guayas, Ecuador
[12] Respiralab, Quito, Ecuador
[13] UNA, Hosp Clin, Fac Ciencias Med, Asuncion, Paraguay
[14] Bernstein Allergy Grp Inc, Cincinnati, OH USA
[15] Republ Univ Uruguay, Montevideo, Uruguay
[16] Clin Int, Lima, Peru